Compound interest

Interest paid on the balance, so each year's interest earns interest itself.

The compound interest formula

Raising the multiplier to the number of years to reach the balance in one step.

Depreciation

A value falling by a fixed percentage each year, via a multiplier below 1.

Finding how long growth takes

Multiplying period by period until a target is passed, counting whole periods.

Practice

Compound interest

Interest paid on the balance, so each year's interest earns interest itself.

Practice

The compound interest formula

Raising the multiplier to the number of years to reach the balance in one step.

Practice

Depreciation

A value falling by a fixed percentage each year, via a multiplier below 1.

Practice

Finding how long growth takes

Multiplying period by period until a target is passed, counting whole periods.

Practice

Growth and decay review

Interest, depreciation and exponential change, with linear growth for contrast.

Mixed review